==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
Read of size 1 at addr ffff88807bf58745 by task dhcpcd-run-hook/14852

CPU: 1 PID: 14852 Comm: dhcpcd-run-hook Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
 tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
 tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
 tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:637
 call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x6a2/0xaf0 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1107
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:unwind_next_frame+0x359/0x1cc0 arch/x86/kernel/unwind_orc.c:461
Code: 00 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 0f b6 04 02 4c 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 a7 08 00 00 41 0f b6 40 04 <a8> 0f 0f 85 b5 00 00 00 49 8d 78 05 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000319f468 EFLAGS: 00000246
RAX: 0000000000000015 RBX: 0000000000000001 RCX: ffffffff89421623
RDX: 0000000000000006 RSI: ffffffff8ef8329a RDI: ffffffff8e53d534
RBP: ffffc9000319f520 R08: ffffffff8ef8329a R09: ffffc9000319f50c
R10: fffff52000633ea6 R11: 000000000008c07e R12: ffffc9000319f50d
R13: ffffc9000319f4d8 R14: ffffffff89421623 R15: ffffffff8ef8329e
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1669 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
 slab_free mm/slub.c:3599 [inline]
 kmem_cache_free_bulk.part.0+0x205/0x780 mm/slub.c:3717
 mt_free_bulk lib/maple_tree.c:163 [inline]
 mas_destroy+0x394/0x5c0 lib/maple_tree.c:5769
 mas_store_prealloc+0xec/0x150 lib/maple_tree.c:5704
 __vma_adjust+0x765/0x1a70 mm/mmap.c:810
 vma_adjust include/linux/mm.h:2664 [inline]
 __split_vma+0x295/0x5c0 mm/mmap.c:2239
 split_vma+0x9f/0xe0 mm/mmap.c:2272
 mprotect_fixup+0x746/0x960 mm/mprotect.c:621
 do_mprotect_pkey+0x6fd/0xa70 mm/mprotect.c:790
 __do_sys_mprotect mm/mprotect.c:817 [inline]
 __se_sys_mprotect mm/mprotect.c:814 [inline]
 __x64_sys_mprotect+0x74/0xb0 mm/mprotect.c:814
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f59d9bfd297
Code: 44 00 00 b8 0b 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d 21 1f 01 00 f7 d8 89 01 48 83 c8 ff c3 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d 01 1f 01 00 f7 d8 89 01 48 83
RSP: 002b:00007ffda4c834d8 EFLAGS: 00000206 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f59d9bfd297
RDX: 0000000000000000 RSI: 000000000001c000 RDI: 00007f59d991f000
RBP: 00007ffda4c83840 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000802 R11: 0000000000000206 R12: 00007ffda4c834e0
R13: 0000000000000000 R14: 0000000000000001 R15: 00007f59d9bdbf00
 </TASK>

Allocated by task 3638:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x7e/0x80 mm/kasan/common.c:325
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:754 [inline]
 slab_alloc_node mm/slub.c:3336 [inline]
 slab_alloc mm/slub.c:3344 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3351 [inline]
 kmem_cache_alloc+0x2b7/0x3d0 mm/slub.c:3360
 kmem_cache_zalloc include/linux/slab.h:685 [inline]
 net_alloc net/core/net_namespace.c:404 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3193
 __do_sys_unshare kernel/fork.c:3264 [inline]
 __se_sys_unshare kernel/fork.c:3262 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3262
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 10052:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
 ____kasan_slab_free mm/kasan/common.c:236 [inline]
 ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1669 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
 slab_free mm/slub.c:3599 [inline]
 kmem_cache_free+0xea/0x5b0 mm/slub.c:3621
 net_free net/core/net_namespace.c:433 [inline]
 net_free net/core/net_namespace.c:429 [inline]
 cleanup_net+0x8ba/0xb00 net/core/net_namespace.c:616
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x693/0x13b0 kernel/workqueue.c:1517
 call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers.part.0+0x4a3/0xaf0 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1805
 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571

Second to last potentially related work creation:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481
 insert_work+0x48/0x350 kernel/workqueue.c:1358
 __queue_work+0x693/0x13b0 kernel/workqueue.c:1517
 call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers.part.0+0x4a3/0xaf0 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1805
 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571

The buggy address belongs to the object at ffff88807bf58000
 which belongs to the cache net_namespace of size 6976
The buggy address is located 1861 bytes inside of
 6976-byte region [ffff88807bf58000, ffff88807bf59b40)

The buggy address belongs to the physical page:
page:ffffea0001efd600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bf58
head:ffffea0001efd600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff8880119d4500 dead000000040004 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3638, tgid 3638 (syz-executor.0), ts 165194481510, free_ts 165193602533
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280
 alloc_slab_page mm/slub.c:1739 [inline]
 allocate_slab+0x213/0x300 mm/slub.c:1884
 new_slab mm/slub.c:1937 [inline]
 ___slab_alloc+0xac1/0x1430 mm/slub.c:3119
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217
 slab_alloc_node mm/slub.c:3302 [inline]
 slab_alloc mm/slub.c:3344 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3351 [inline]
 kmem_cache_alloc+0x31c/0x3d0 mm/slub.c:3360
 kmem_cache_zalloc include/linux/slab.h:685 [inline]
 net_alloc net/core/net_namespace.c:404 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
 ksys_unshare+0x445/0x920 kernel/fork.c:3193
 __do_sys_unshare kernel/fork.c:3264 [inline]
 __se_sys_unshare kernel/fork.c:3262 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3262
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1458 [inline]
 free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508
 free_unref_page_prepare mm/page_alloc.c:3386 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482
 skb_free_head+0xac/0x110 net/core/skbuff.c:662
 skb_release_data+0x5f1/0x870 net/core/skbuff.c:691
 skb_release_all net/core/skbuff.c:756 [inline]
 __kfree_skb net/core/skbuff.c:770 [inline]
 consume_skb net/core/skbuff.c:935 [inline]
 consume_skb+0xc2/0x160 net/core/skbuff.c:929
 netlink_recvmsg+0x598/0xe50 net/netlink/af_netlink.c:1998
 sock_recvmsg_nosec net/socket.c:995 [inline]
 sock_recvmsg net/socket.c:1013 [inline]
 sock_recvmsg net/socket.c:1009 [inline]
 ____sys_recvmsg+0x2c7/0x610 net/socket.c:2701
 ___sys_recvmsg+0xf2/0x180 net/socket.c:2743
 __sys_recvmsg+0xf0/0x1c0 net/socket.c:2773
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88807bf58600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807bf58680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807bf58700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88807bf58780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807bf58800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 7 bytes skipped:
   0:	df 4c 89 fa          	fisttps -0x6(%rcx,%rcx,4)
   4:	48 c1 ea 03          	shr    $0x3,%rdx
   8:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
   c:	4c 89 fa             	mov    %r15,%rdx
   f:	83 e2 07             	and    $0x7,%edx
  12:	38 d0                	cmp    %dl,%al
  14:	7f 08                	jg     0x1e
  16:	84 c0                	test   %al,%al
  18:	0f 85 a7 08 00 00    	jne    0x8c5
  1e:	41 0f b6 40 04       	movzbl 0x4(%r8),%eax
* 23:	a8 0f                	test   $0xf,%al <-- trapping instruction
  25:	0f 85 b5 00 00 00    	jne    0xe0
  2b:	49 8d 78 05          	lea    0x5(%r8),%rdi
  2f:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  36:	fc ff df